rust/library/core/tests/task.rs

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use core::task::Poll;
#[test]
fn poll_const() {
// test that the methods of `Poll` are usable in a const context
const POLL: Poll<usize> = Poll::Pending;
const IS_READY: bool = POLL.is_ready();
assert!(!IS_READY);
const IS_PENDING: bool = POLL.is_pending();
assert!(IS_PENDING);
}